Hi, and thank you for your interest!
ScummVM is being translated using Weblate, a web tool designed to ease translating for both developers and translators.
Translation project for ScummVM into Czech currently contains 1000 strings for translation and is 93.3% complete.
If you would like to contribute to translation of ScummVM, you need to register on this server.
Once you have activated your account just proceed to the translation section.